Answer :

A manufactured air duct that meets all 15 UL 181 tests is classified as a UL 181 Listed air duct, indicating its compliance with safety and performance standards set by Underwriters Laboratories.

A manufactured air duct that meets all 15 UL 181 tests is classified as a UL 181 Listed air duct. UL 181 is a standard developed by Underwriters Laboratories (UL) to ensure the safety and performance of air ducts used in HVAC systems.

To meet the UL 181 tests, the air duct must undergo various tests to assess its strength, durability, fire resistance, and ability to prevent the spread of smoke and flame. These tests evaluate factors such as air leakage, maximum velocity, pressure, and temperature ratings.

Being UL 181 Listed means that the air duct has met all the necessary criteria set forth by UL and has been certified as safe and reliable for use in HVAC systems. This classification provides assurance to consumers and professionals that the air duct complies with industry standards and regulations.

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